15) Give the number of core electrons for Cd. A) 44 B) 48 C) 46 D) 45 E) 47 16) Give the number of valence electrons for Cd. A) 8 B) 10 C) 12 D2 E) 6 17) How many valence electrons does an atom of Al possess? A) 1 B) 2 C) 5 E) 8 18) How many valence electrons do the halogens possess? A) 5 B) 6 C) 2 D) 1 E) 7 19) How many valence electrons do the alkali earth metals possess? Al ® 2 C) 7 D) 6 E) 8 20) How many valence electrons do the alkali metals possess? A) 1 B) 2 C) 7 D) 6 E) 8